Following scripts can be used for scripted validators within the workflow

issue.projectObject.name == "My First Project Name"

if ( cfValues['FIELD1']?.value == 'Yes') { 
    if ( cfValues['FIELD2'] ) {
        return true
    } 
    else return false
     }
 else return true

Date today123 = new Date()
if ( cfValues['FIELD1'] ) { 
    if ( cfValues['DATEFIELD2'].getTime() > today123.getTime() ) {
        return true
    } 
    else return false
     }
 else return true

def selectedSegment = cfValues['Segment']
def selectedSegmentString = selectedSegment.toString()
if ( selectedSegmentString.equals("Some String") ){
    // do something here
 
}

import com.atlassian.jira.component.ComponentAccessor;
//import com.atlassian.jira.ComponentManager;
import com.atlassian.jira.issue.CustomFieldManager;
//import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.IssueManager;
//import com.atlassian.jira.issue.Issue;
//import com.atlassian.jira.issue.ModifiedValue;
//import com.atlassian.jira.issue.util.DefaultIssueChangeHolder;
 
def customfield_ID = "customfield_11700"
def issueManager = ComponentAccessor.getIssueManager()
def customFieldManager = ComponentAccessor.getCustomFieldManager()
def cField = customFieldManager.getCustomFieldObject(customfield_ID)
def cFieldValue = issue.getCustomFieldValue(cField).toString()
 
 
if (cFieldValue.size() > 3){
    return false
}
else{
    return true
}